Kafka Consumer outputs excessive DEBUG statements to console (ecilpse)

Just modify the logging level of the chatty class (chatty interaction). Since in your logs you see log entries originating from org.apache.kafka.clients.consumer.internals.Fetcher you can simply adjust the logging level for that logger by adding following line to log4j.properties:

log4j.logger.org.apache.kafka.clients.consumer.internals.Fetcher=WARN

... or any wider catching logger since these are name spaced:

# adjusting logging for entire Kafka
log4j.logger.org.apache.kafka=WARN

Hope this helps

create new config xml file

src/main/resources/logback.xml

<configuration>
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
        </encoder>
    </appender>
    <logger name="org.apache.kafka" level="WARN"/>
    <logger name="org.apache.kafka.common.metrics" level="WARN"/>
    <root level="warn">
        <appender-ref ref="STDOUT" />
    </root>
</configuration>

Not sure if you are talking about kafka-console-consumer commands, if yes this is what I did:

[training@confluent-training-vm ~]$ cd /etc/kafka
[training@confluent-training-vm kafka]$ grep DEBUG *.properties
log4j.properties:# Change to DEBUG or TRACE to enable request logging
log4j.properties:# Access denials are logged at INFO level, change to DEBUG to also 
log allowed accesses
tools-log4j.properties:log4j.rootLogger=DEBUG, stderr

So, you just need to edit /etc/kafka/tools-log4j.properties file and remove DEBUG (or replace it for exmaple by INFO and WARM log levels on above line

tools-log4j.properties:log4j.rootLogger=INFO, WARM, stderr